First Circular (English Version)
ALMA Workshop「Starburst-AGN Connection - Toward the Merger-Driven Unified Model
for Triggering Nuclear Activities」
【Dates】Workshop 2016 Feb 16（Tue）13:00 - 17 (Wed) 16:00
Working group discussion 2016 Feb 18 (Thu) 9:00 - 16:00
（Since working group discussion is optional,
the attendance of workshop only is welcome.)
【Venue】Lecture Room, Institute of Astronomy, The University of Tokyo, Mitaka, Japan
This is to inform that we will have an ALMA workshop on "Starburst-AGN Connection -
Toward the Merger-Driven Unified Model for Triggering Nuclear Activities"
(see above for the dates and the venue).
It has been often discussed that galaxy mergers play important roles in triggering both
nuclear starbursts and active galactic nuclei (AGNs). In fact, the following two ideas
have been proposed to explain the formation of AGNs through the starburst phase.
(1) A major merger between/among gas-rich galaxies drives the formation of a quasar
through the phase of ULIRG (i.e., ultra luminous starburst). And, (2) a minor merger
with a nucleated satellite drives the formation of a Seyfert galaxy through the phase of nuclear starburst.
If we adopt these two ideas together, we have a possible unified triggering mechanism of AGNs
driven by galaxy mergers (Taniguchi 2013, ASPC, 477, 265).
In order to obtain firm lines of evidence for this scenario, we are planning to observe
both starburst and Seifert galaxies in nearby Universe in CO with ALMA
because its high-angular-resolution capability enables us to investigate
detailed molecular gas dynamics of our sample galaxies with a several-pc resolution.
The scenario given above predicts that STARBURST COMES FIRST, and then
AGN COMES LATER. Therefore, the molecular gas in starburst galaxies is expected
to be more disturbed with a larger scale. It is also expected that the nuclear molecular gas disk
is misaligned to the host disk because minor mergers could occur taking random orbits.
We will discuss this scenario in more detail from both observational and theoretical aspects
and then our observational plan for ALMA Cycle 4 in this workshop.
・Dave Sanders (IfA, University of Hawaii)
・Luis Ho (KIAA)
・Ken Nagamine (Osaka University)
・Takayuki Saitoh (ELSI, TITECH)
・Yoshi Taniguchi (RCSCE, Ehime University)